1. 三角   cylinder   square   triangle   rectangle   Hint Half-n-half Clue   2. 正方形   radius   square   diameter   perimeter   Half-n-half Clue   3. 邊   rectangle   circumference   square   side   Half-n-half Clue   4. 立方體   radius   point   cube   perimeter   Half-n-half Clue   5. 球形   perimeter   sphere   point   rectangle   Half-n-half Clue   6. 點   point   sphere   curve   triangle   Half-n-half Clue   7. 線   curve   triangle   point   line   Half-n-half Clue